Electric stove.



C. A. PFANSTIEHL.

ELECTRIC STOVE.

APPLICATION FILED 11017.11, 1912.

1,062,299. y Patentedmayzo, 1913.

, Y u Y ZSHEETS-SHEET 1.

C. A. PFANSTIEHL.

ELECTRIC STOVB.

APPLIOATION FILED 11011.11, 1912.

1,062,299; Patented May 2o, 1913.

2 8HEETS"SHEET 2.

y Ey cara @fami-@u v attached to the base.

Referring to the drawings, 7 is the central part of the top plate of the stove; 8y

A. PFANS'IIEL, 0F NORTH CHICAGO, ILLINOIS.

ELECTRIC vs'royn.

Specification of Letters Patent.

Patented May 2o, i913.

Application led November 11,` 1912, Serial No. 730,634.

'i T0 all whom t may concern.:

Be it knownthat I, CARL A. PFANSTIEHL,

a citizen of the United States, residing at North Chicago, in the county of Lake and State of Illinois, have invented a new and useful Improvement in Electric Stoves, of

which the following is a specification.

My invention relates to certain new -and useful improvements in electric stoves, and is fully described4 and explained in the specification and shown in the accompanying drawings, in which Figure 1 is a plan view of my improved A device; Fig. 2 is a diametrical section on the line 2, of Fig. 1; Fig. 3 is a diagrammatic l View lof the circuit; Fig. ,4 is a radial secv aratedby an annular depression formed by, bending down the sheet-metal of which bothl tion on the line 4 of Fig. 1; Fig. 5 is a horizontal section on the line 5 of Fig. et, and

Fig. 6 is a side elevation showing the man-V ner in which the upper part 'of the stove is is an annulus'surrounding the same. These twoparts being made of sheet-metal septhe' central part and the annulus are composed. The bottom of the depression'.l is punched out tofleave short `connecting webs between the center and the annulus. The

outer margin of the annulu's is carried down,-

in the form illustrated, and the space withinl the' same, as well asthat within the central'top-plate, is lilled with cement in which I thread a spiral coil of a suitable resistor or resistance-element. The coil within the; central part of the stove .is indicated by 10 and' that in the annulus by 1l, and as willv hereinafter be explained',` these coils are insulated from each other as shown in Fig. 5,one' half` being iny electrical connection with the -plug 16 and the other in electrical made independent and with separate terminals. I' i 'Y Underneath the t'op'pa'r't of the stove is a an 1'2 erforated however. b o nin p p 7 y pe gg nectionismade with'theplugl? accessis given to one Aend of both the coils of the stove; 1 9 @and l20L` are two jacks mounted on the ends which register with the openings in the bottom of the depression between the annulus yand central part of the `topplate,'and in `this sulatln ymaterial 13, likewise similarly pan 'is a sheet of asbestos or otherfinforate 'so that' any material which 'into thel depression between the'annul'us and' f center of' the stove will fall 'through the .depression and' noty accumulate and" burn.

compact and rigid heat-ing member-to which when current is applied and a base attached, nothingelse need be added for general purposes. The heating member is made with the central part and the .separate annulus for the following reasons: For general' cooking, a stove of considerable diameter is required and, in this case, both parts of the heating member will be supplied with`cu'rrent at once. 'Howeverg for making collee in the commonly used percolato',rfty'pe'` of coffee-pot only a very small heating surface is required, Vand' for such purposes the' central part of the presentstove is designed. This central member, as shown, is of' sub'- stantially the exact size required for this purpose, and is satisfactory in such operation when energized alone.. The outer member may be energized' by itself, when desired, for; `certain types of cooking, as

for instance, where a moderate heat is required as in a chatting-dish. at certaintilnes of its operation, orthetwomembersfcan be energized in series with the consumption of very small current to maintain a .gentle heat. To accomplish these results four plugs are provided, asfsh'ownin Figthe pan 12. These four plugs areidicated,

. 5,. these being supportedv as'shown .4, by a downwardly-projecting flange on -`respec ti'vely, by 15,16, 17 'f and 18. The plug l5 is attached to one end of both the coils of the heatingmembe'r, as shown in .thediagrammatic view in Fig. 8.: The plug 16 is attachedto the .oppsite'end of the zinner coil or that in the .central part ,of

the stove, while the plug 18y is'attachd to lthe corresponding endv of the'ou-te'r coil, orvv that in'the annulus of the stoye. The plug 1'7--is` -ar c,ompound-plngr made of twohalves connection with the plug 18. Thus when con'- -of exible :cords -andadapted, at' will, to -,be inserted upon the plugs, but these jacks are. made of such diameter and the plugs `16,117 and -18 are so placed with .reference tof that diameter that-,the jacksv cannot vbe placed gon two of said plugs which are adjacent-5to#"each'- otl1cr. 'In' other words', if

jacks 19 and 2O be put on the plugs 16 and obtained were the jacks. put say, for in-` stance, on the plugs 16 and 17 slrnultaneously, or on the plugs 17 and '1 8'simultaneously. If thejack 19 be put o-n the plug 15 and the plug 2O on the plug 16, the centerof the stove will be heat-ed. If the plug 20 be put 'on'the plug 18 the outer annulus will be energized, and if 'the jack 20 be put on theplug 17, both sections of the stove will be heated. On the other hand if'the l, I the only other possible positions they can occupy, then in an obvious manner, cur- -rent will'iiow through both coils in series,

thereby heat-ing the entire stove but to a very slight degree. i

The entire structure above described is supportedby a base'21 which is stamped up out of sheet-metal. -This base consists of a plate of sheetmetal with three downwardlystamped legs and three upwardly-stamped projections, each of which has, as shownin Fig. 6, a slot provided with an enlarged end adapted -to engage with a projecting lstud upon a downwardly-projecting part of the top-plate of the stove. Thus, by slightly rotating the top-plate with reference to the base and springing out these upward projections thereof, the top-plate can be removed for ready cleaning of the base, but,

-in practice,`the space is such that unless the base requires scouring it can be cleaned olf without such removal of the top.

I realize that considerable variation vis possible in the' details of the constructlon herein shown and described, and I therefore do not intendto limit 1n self to such construction specilicall my lntention being, in the Aclaims hereina ter set forth, to specify all-the novelty .which is inherent in the con# structionillustrated. Y y

What I 'claim as new and desire to secure by Letters Patent isj 'f ,-1. An electric stove having a vcentral circular part, an outer annular part concentric therewith, resistors for? heating each part independently of the other, and means to lead current to said resistors independently, said two par-tsbeing separated to alford between them 'an annulatr air-space whereby, when thecentral part heated alone the conduction of heattothe outer annulus is i substantially prevented. y

2. An electric stove. having a central cir- `resistors, said parts being separated to .afford between them an annular heat-.insulating space i whereby when the centra1"partis jacks can lit the first and second heated alone the outer-annulus remains substantially unheated.

3. An electric stove having a central part and an outer annulus, a resistor in each of said parts, means to lead current to said resistors .independently or simultaneously in parallel or in series, said means consisting both resistors, one to the other end of one resistor and the'other to the end of the other resistor, and afourth having two parts, one of which is connected to one end of one resistor and the other is connected to thecorresponding end of the other resistor, and jacks adapted to fitthelrst-named plug and either of the others, or alternatively, `to lit simultaneously the second and third-named plugs, the second, third and fourth plugs being arranged as described at such intervals that the jacks can not fit adjacent plugs of thesecond, third and fourth simultaneously.

. 4. An electric stove having a central part and an outer annulus, a resistor in each part,

a series of four plugs, the first of which is connected to one end of both resistors, the second of which is connected to the opposite end of one resistor, the fourth of which is Aconnected to the opposite end'ofthe other resistor and the third of which has two parts, one having electrical connection with the second and the other electrical connection with the fourtlf plugs, jacks adapted to fit said plugs, the second, third and fourth plugs being so placed that the jacks can not simultaneously be'placed on adjacent plugs thereof but the first plug being placed at suiicient distance from the second that both plugs, for the purpose set forth.

5. In an electric stove, a-top-platehaving a circular depression between its center and circumference whereby it is divided into a central part and an outer annulus, a resistor ineach part, a plastic-insulating material surrounding the resistors and filling the topplate. i f

6. Inf an electric stove, a top-plate having a circular depression between its center and circumference whereby it. is divided ,into a central part andan outer annulus, a resistor` in ,each part, a plastic-insulating material sur-rounding the resistors and filling the topplate, said depression beingV cut through at intervals,- for the purpose set forth.

7. Inan electric stove, a circular plate with a peripheral flange and provided with a circular depression between the flange and thecenter dividing the top-plate into an inner part andan outer annulus, resistors in said inner part and outer annulus, and a vbody of cementitious-insulating material filling the central part .and the outer annulus thus formed.

j. 8. Au electric stove `having a top-plate with a downwardly-turned ange and a eircular depression between the ange and the center dividing the top-plate into -a circular central part and an outer annulus, resistors in said parts, 'cementitious-insulating material iilling said parts and surrounding the resistors, an asbestos plate beneath the topplate and its contents, a pan beneath thev asbestos plate and means consisting of inwardly-turned tongues for holding the parts together.

9. In an electric stove, an upper partand a. base, the base consisting of a plate with downwardly-turned radial projections to form legs, and upwardly-turned radialv projections attached to the top part of the stove,

.for the purpose set forth.

10. In an electric stove a base consisting of a vplate of sheet-metal with downwardlyturned projections to form legs, and upwardly-turned projections to support a heating member. L

11. In an, electric stove a top-plate, a heating element within fthe' same andl a downwardly-turned flange integral therewith, and a series of plugs carried by said Harige, for the purpose set forth. Y In testimony whereof I have hereunto set my hand this 23 day of October, 1912.

CARL A. PFANsTIEHL. In presence of two subscribing witnesses:

E. D. TUTTLE, J. LANDERMAN. 

